Inverted-design for highly-active hydrogen evolution electrocatalyst of MoS2@Ni3S2 core-shell via unlocking the potential of Mo

Through inverted-design rather than modifying the generally-assumed S active sites in popular MoS2, we unlock the potential of Mo sites and successfully prepared novel MoS2@Ni3S2/NF core-shell nanospheres as a catalyst for the high-performance hydrogen evolution reaction (HER). The ΔGH at the Mo site is optimized via Ni3S2 to achieve excellent HER activity. At low current densities, it has similar activity to the Pt/C. However, its performance is better than Pt/C at high density. Moreover, our catalyst shows a considerable stability at a variety of current densities for 50 h, promising to substitute noble metal catalysts in application of commercial alkaline electrocatalysts.